elizabeth corridan is monitoring the situation from washington, d-c. >> reporter: >> as >> as we gather with so much, we need to guide our lawmakers with your wisdom. this evening. >> reporter: the senate will reconvene monday morning, at which point there will be just over 12-hours until the u.s. goes over the fiscal cliff. the senate convened its rare sunday session with a prayer for progress. the house returned from its holiday hours until the u-s economy goes over what's being called the fiscal cliff - lawmakers are locked in a fierce face-off over a set hikes. "we're apart on some pretty big issues." " >> i'm willing to get this done, but i need a dance partner." >> reporter: on n-b-c's meet the press, president obama made a final pitch for his plan to preserve bush era tax cuts for everyone but the wealthiest americans. >> "regardless of partisan differences, our top sure that taxes on middle that would hurt our economy badly." >> reporter: a major sticking point continues to be the annual income level at which those tax increases should kick in. the threshold has wavered from 250